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Chen Q.,Jiangyin Xingcheng Special Steel Works Co. | Yang Y.,Shanghai University | Yin X.,Shanghai University | Luo W.,Shanghai University
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2010

In order to resolve surface crack resulting from the casting thermal stress during the continuous casting ZF steel slabs, a geometric-physical model was established, in which the combination of the Adstefan software with temperature field measured actually was considered. Filling and solidification of the ingots were simulated by the model at different over-heating degrees, different drawing velocities and different tapers of the mould to observe the stress distribution in the slabs. The results reveal that with increasing in drawing velocities, thermal stress in the billet shell is decreased. However, excessive high drawing velocity can lead to thin the thickness of the shell, easily resulting in the leakage of liquid steel, even more the occurrence of reunion, so the surface crack would occur in the slabs during rolling process. With increasing in drawing velocities, leakage of liquid steel and reunion should be controlled as possible. With increasing in over-heating degree, thermal stress in the shell is increased, so during production, over-heating degree should be decreased as possible to decrease thermal stress. Meanwhile, with increasing in taper of mould, thermal stress in the shell is increased, so during production, proper taper of mould should be considered to decrease the thermal stress. At the same conditions, the thermals tress in the corner of the shell is evidently higher than that in the other positions. Camber angle can be adopted in design of the mould to effectively decline the thermal stress in the shell. In addition, effects of drawing velocity on thermal stress are higher than over-heating degree.

Xu X.,Jiangyin Maritime Safety Administration | Zhang Y.,Jiangyin Xingcheng Special Steel Works Co. | Liu M.,Wuhan University of Technology | Xu Y.,Wuhan University of Technology
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2011

Based on the demands on ultra-large-scale ship with partial load, significance of ultra-large-scale ship with partial load navigating into Yangtze River was analyzed. Model of necessary width for navigation in bend waterway for ultra-large-scale ship was put forward based on wind-induced drift, current-induced drift and geometric magnitude. With the model, the necessary width was calculated for 150000 GT ship navigating through Fu Jiang Sha Waterway in Jiangyin.

Moering J.,North Carolina State University | Ma X.,North Carolina State University | Chen G.,Jiangyin Xingcheng Special Steel Works Co. | Miao P.,Jiangyin Xingcheng Special Steel Works Co. | And 5 more authors.
Scripta Materialia | Year: 2015

In this study, the shear strain at various depths of a low carbon steel processed by Surface Mechanical Attrition Treatment (SMAT) was measured using deformed carbide bands as internal strain markers. The shear strain gradient is found to strongly correlate with the gradients of texture, microstructure and hardness. The microhardness increases approximately linearly with shear strain, but deviates at the top surface. In the top surface, the average ferrite grain size is reduced to 60 nm with a strong {1 1 0}//SMAT surface texture. © 2015 Acta Materialia Inc.

Mao P.,Jiangyin Xingcheng Special Steel Works Co. | Mao P.,University of Birmingham | Knott J.F.,University of Birmingham
7th International Conference on High Strength Low Alloy Steels, HSLA Steels 2015, International Conference on Microalloying 2015, Microalloying 2015 and International Conference on Offshore Engineering Steels 2015, OES 2015 | Year: 2015

Tensile tests and fracture toughness tests supported by detailed fractographic examination have been carried-out on two sets of C-Mn weld metal samples with identical microstructure but different inclusion surface features. The tests showed that the tensile and fracture toughness properties were not significantly changed by the presence or absence of sulphide "patches" formed on inclusions. Analysis at a detailed level suggests that cleavage fracture initiated from inclusions with "sulphide" patches tends to be associated with higher fracture toughness than initiated from inclusions without "patches". The fractographic investigation revealed that inclusions initiated cleavage in three ways: (1) inclusion cracking followed by crack propagation into matrix, (2) inclusion decohesion from the matrix accompanied by cracking adjacent particle or brittle phase to trigger cleavage, and (3) cleavage starting from an inclusion with local inclusion/matrix interface separated. No sulphide "patches" were found on inclusions associated with the first mode of cleavage initiation, but sulphide "patches" were always associated with the second and third modes. Relationship between the cleavage initiation modes, nature of a sulphide coating, and fracture toughness are discussed.

Dai W.,Northeastern University China | Wang X.,Northeastern University China | Zhang D.,Northern Engineering and Technology Co. | Sun D.,Dongfang Electrical Machinery Co. | And 2 more authors.
IOP Conference Series: Materials Science and Engineering | Year: 2011

The effect of calcia on the grain growth of yttria was investigated in present work. The results shown that by adding calcia, yttria was sintered as low as 1300°C and abnormal grain growth model was observed over 1500°C. When higher than 1600°C, lots of closed pores were formed in the coarse yttria grains and the relative density was decreased with the increasing temperature and prolonging soaking time. Through theoretical analysis, it was known that oxygen vacancies were formed during the solid solution of Ca 2+ into Y3+ and they were ascribed to the increasing of grain boundary diffusion of yttria. The developed yttria might be an applicable material for vacuum induction melting process to produce high purity titanium and its alloys. © 2011 Ceramic Society of Japan.

Xu X.,Jiangyin Xingcheng Special Steel Works Co. | Liu J.,Jiangyin Xingcheng Special Steel Works Co. | Zhou Q.,Jiangyin Xingcheng Special Steel Works Co. | Cai X.,Jiangyin Xingcheng Special Steel Works Co. | Chen R.,Jiangyin Xingcheng Special Steel Works Co.
Proceedings of the 6th International Congress on the Science and Technology of Steelmaking, ICS 2015 | Year: 2015

The global industries of machinery, automobile, construction, etc. have necessitated the development of steelmaking process capable of producing large quantities of high quality special steel such as bearing steel, gear steel, tube steel etc.. How to make the inclusion, which shows different effects in different steel grades, but harmful mostly, in an ideal state has been a long-term issue for most metallurgical practitioners. For satisfying steel performance property requirements, cleanliness class and composition, morphology, distribution of inclusions of every steel grade for different customers were clearly defined and achieved after quantities of trails of harmless treatment in Jiangyin Xingcheng Special Steel (JYXC). By studying the required steelmaking technologies and related quality assurance methodologies, as well as investing in best practice processes, JYXC currently produces >5 Mtons of high quality steel for global customers.The technology development events and the journey leading to the current leading position are described in this paper.

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